Abstract

Some heavy metals are harmful and dangerous and cause many risks for food and public health. Also accumulated in fish such as tuna fish as a result of contaminated water or during transport, processing or canning. The present study was conducted to measure the concentration of some heavy metals (Pb, Cd, Al, Hg, Ni, Co and Cr) in canned tuna of five brands. Materials and Methods: Forty canned tuna samples from five brands were examined to determine their metal concentration. The samples were collected from supermarkets found in Assiut city (Egypt) from June 2017 to November 2017. The metals were determined using Atomic Absorption Spectrometer Perkin Elymer (Analyst 400) for Pb, Cd, Co, Ni and Cr while Hg was estimated by using ICP (iCAP 6200) and Al was determined using Atomic Absorption Spectrometer (ZEEnit700P). Results: The results revealed that the levels (ppm wet weight) of metals were as following in the examined five brands:

In Sohag City, 400 samples were collected from different food markets of different meat products from two companies with high and low prices (e.g., minced meat, kofta sausage, beef burger, and luncheon meat) for determining food fraud. Light, fluorescence, and scanning electron microscopy (SEM) were used to examine the samples."Special histochemical stains" permit the microscopic examination of different cell types, structures, and/or microorganisms. Histological examination revealed variant tissue types, besides skeletal muscles. Nuchal ligaments, bones, hyaline cartilages, white fibrocartilages, large and medium arteries, cardiac muscles, tendons, and collagenous connective tissues comprised the capsule of a parenchymatous organ. Additionally, a crystal of food additives was recognized using light microscopy and SEM. SEM allows the visualization of bacterial contamination. Using different microscopic anatomy techniques is an efficient methodology for qualitative evaluations of various meat products. No difference in quality was observed between low-and high-priced meat products.

No abstract